ERROR opening https://cactus.nci.nih.gov/chemical/structure/NC12CC3%28CC%28C1%29%28CC%28C2%29C3%29C%29C/file?format=sdf&get3d=True  -- NC12CC3%28CC%28C1%29%28CC%28C2%29C3%29C%29C could not be loaded.